Fix pages navigation issue

lib/ui/routes/main_route/main_route.dart

@@ -87,7 +87,9 @@ abstract class MainController extends State<MainRoute> {
 
   /// Open user page
   void openUserPage(int userID) => pushPage(PageInfo(
-      type: PageType.USER_PAGE, child: UserPageScreen(userID: userID)));
+      type: PageType.USER_PAGE,
+      child: UserPageScreen(userID: userID),
+      id: userID));
 
   void openUserAccessDeniedPage(int userID) =>
       pushPage(PageInfo(child: UserAccessDeniedScreen(userID: userID)));

lib/ui/routes/main_route/page_info.dart

@@ -22,7 +22,10 @@ class PageInfo {
   final bool hideNavBar;
   final bool canShowAsDialog;
 
-  const PageInfo({
+  /// Unique identification of this child
+  final key = UniqueKey();
+
+  PageInfo({
     this.type = PageType.OTHER_PAGE,
     @required this.child,
     this.id,

lib/ui/routes/main_route/tablet_route.dart

@@ -73,9 +73,10 @@ class _TabletRouteState extends MainController {
       );
 
   Widget _buildRightPane() => Container(
-        width: MediaQuery.of(context).size.width - _SideBarSize,
-        child: currentPage.child,
-      );
+      key: currentPage.key,
+      width: MediaQuery.of(context).size.width - _SideBarSize,
+      child: currentPage.child,
+    );
 
   @override
   void pushPage(PageInfo page) {